But one of the things you can now bring on-board is causing quite a stir.

It's a pocket knife.

Small baseball bats that are 24 ounces or less, golf clubs, a pool cue, a lacrosse stick and even ski pole are all now allowed as carry-on.

With aircraft overhead space already scarce, nobody knows just where all this stuff will go.

But causing the biggest passenger and crew concerns are the pocket knives.

To bring them on-board, the knife blades must be 2.36 inches or less and no more than a half inch wide.

But still on the banned list are box cutters, razors and knives with molded grips or fixed blades.

"I don't ever want to get on a plane if someone could bring that on there," said Maria Walker, an airline passenger.

"I don't like it. It's dangerous. Somebody could stab you while you are on the plane. I don't like it all," said another passenger, Jorge Perez.

And passenger Larry Batchelor added "I am just concerned for the safety of the passengers regardless of the fact that the cockpit doors are reinforced. I am thinking about the crew and the passengers."

It's a worry shared by flight attendants.

"We believe this is a slippery slope. What will be the next weapon that can come aboard. We are here to protect and serve passengers and also ourselves and we don't want to see weapons unnecessarily introduced on-board the aircraft," said Veda Shook of the Association of Flight Attendants.

But not everyone is against bringing pocket knives on-board.

"I don't have a problem with it. I used to carry a knife bigger than that when I flew before the tragedy," said passenger Michael Mason.

For now the TSA is sticking to its plan to make the changes at the end of April.